Custom symbols can be themeable

[NotMyFault]

Describe your use-case which is not covered by existing documentation.

If custom symbols have a stroke set, they are themable, core replaces the value with currentColor to make those symbols reactive to themes.
We should probably outline that on the symbols page, considering people may use custom SVGs which have no property set, leading to unthemable symbols.

Reference any relevant documentation, other materials or issues/pull requests that can be used for inspiration.

No response

[uhafner]

Is there a lint for SVG available that checks this?

[timja]

Is there a lint for SVG available that checks this?

It may not be desirable in all cases, i.e. logos.